The fans who have stuck with Grey's Anatomy for 16 seasons have had to deal with a lot. We've cheered for relationships that fizzled out, watched the doctors make poor choices and face consequences, and wondered how many more storylines are even possible after so many episodes.

Like the real people in our lives, characters on our favorite TV shows are always making decisions that make us shake our heads. There are many plot holes on Grey's Anatomy, along with inconsistent moments that we might not have taken note of the first time that we watched a certain episode. We were too caught up in the drama, but now that we think about it, we realize that these things are pretty weird.

Fans of Grey's Anatomy have found some confusing moments and things that don't make much sense in some episodes of the show. Keep reading to find out.

15 Derek Didn't Have Cell Service, Yet Used His Phone Just Fine Before He Died

derek greys anatomy
via Digital Spy

A fan discussion on Reddit brought up this smart point: Before Derek died, he didn't have cell service, and yet he used his phone just fine.

This is a big plot hole since the moments leading up to his death were supposed to be so scary and isolating, but how come he could use his phone?

14 Amelia Gets Her Tumor Taken Out Then Returns To Work In Only Four Days

amelia greys anatomy
via Cosmopolitan

Amelia gets her tumor taken out... then returns to work in four days. This is a huge plot hole on Grey's Anatomy, pointed out by a Reddit post.

This would never happen and she would have to take a lot more time off. That's not exactly a small procedure to have.

13 If Bailey's Son Tuck Is 13 (Which Fans Think He Is), Jo Was An Intern 8 Years Ago, Which Doesn't Add Up

jo on greys anatomy
via E! News

According to a fan discussion on Reddit, people think that Bailey's son Tuck is 13 years old. That would mean that Jo was an intern eight years ago.

Since it doesn't seem like that amount of time has passed, this is a big inconsistency on the show. The more that we think about it, the more confused we get.

12 Izzie Barely Received Any Punishment For Cutting The LVAD, Though She Should Have Lost Her Medical License

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via TV Line

The Odyssey Online points out that Izzie should have had her medical license taken away when she cut Denny's LVAD wire.

This was such a big storyline and we were definitely focused on the drama. But now that we think about it, she barely received any punishment. Surely there should have been some sort of repercussion?

11 Izzie Left Alex With Her Cancer Treatment Bills In One Episode, But Then The Issue Was Never Mentioned Again

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via Us Weekly

Remember when Izzie was suddenly gone from the show? It was so random, and something about it doesn't add up.

We learned that Izzie left Alex with tons of medical bills, but then in following episodes, it was never mentioned again. How could that be? Didn't the writers realize that this needed more explanation?

10 One Moment The Stairs Were On Fire, But Then They Were Fine In The Next Shot

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via Digital Spy

The fire in the season 13 finale was a big deal, and poor Stephanie got caught in the stairwell.

Reddit mentions how the stairs were on fire one minute, then they were totally fine in the next shot. This is an inconsistency that we might not have taken note of, but if we watched the scene again, we would notice it for sure.

9 Meredith Couldn't Have Been Drinking After Giving Her Dad A Piece Of Her Liver

alex meredith greys anatomy
via Tell-Tale TV

The Odyssey Online points out that after Meredith gives her dad, Thatcher, some of her liver, she keeps drinking.

That wouldn't be medically okay, and she would definitely be advised not to do that. Since it's a medical show, it seems odd that this was ignored. It's also strange that Meredith wouldn't know this.

8 DeLuca Is Anxious And Feels Bad About Himself With Maggie, Yet Seems Conceited When He's With Meredith

Maggie DeLuca Grey's Anatomy
via TV Guide

A Reddit post points out that DeLuca is anxious and feels bad about himself when he's seeing Maggie... but when he likes Meredith, he's conceited.

It doesn't make sense that he would switch his personality so much, so this is a big inconsistency on the show. It's hard to unsee it now that we know about it.

RELATED: 15 Reasons We’re Glad Grey’s Anatomy Is Ending

7 Leah Murphy Returns To The Series Only To Disappear And Be Ignored After That

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via Digital Spy

Remember Leah Murphy? We might only vaguely recall this character, because she has been treated kind of strangely on Grey's Anatomy.

A fan mentioned on Reddit that she returns to the series only to disappear and be ignored after that. She was never a super popular character, anyway. Fans are definitely wondering what happened here.

RELATED: 10 Grey’s Anatomy Characters We Respect (And 10 We Never Will)

6 Jackson Should Have Found Out About April's Peanut Allergy Way Earlier

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via Us Weekly

A Grey's fan brought up a really good point on Reddit: it takes Jackson forever to realize that April is allergic to peanuts.

This is a huge issue with the show, because he would know this. They've lived together, they've been friends for a long time, and it absolutely would have been obvious to him much earlier.

5 Bailey Doesn't Support Meredith And Derek, But Seems Fine With Cristina And Burke

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via TV Guide

Miranda Bailey is really weird about the romances that take place at the hospital.

According to this post on Reddit, she doesn't support Meredith and Derek being together. She definitely gets really mad about it. But, she seems totally fine with Cristina and Burke dating. This doesn't make any sense at all.

RELATED: 15 Questions We Need Grey’s Anatomy To Answer Before The Finale

4 Ellis Grey And Richard Webber's Ages When They Were Together Are Always Inconsistent

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via Cosmopolitan

Whenever Ellis Grey and Richard Webber were together in the past on Grey's Anatomy, their ages were always inconsistent.

This is something that a fan pointed out on Reddit: In one episode in 1982 they were twentysomethings, and in a season 10 episode in 1988 they were older than that.

3 With A Five-Year Age Gap Between Maggie And Meredith, They Wouldn't Both Get Promoted To Run Departments

maggie meredith greys anatomy
via TV Guide

According to The Odyssey Online, with a five-year age gap between sisters Maggie Pierce and Meredith Grey, they wouldn't both get promoted to run departments.

This would happen later on for Maggie (even if she was a child genius). We might not have noticed this inconsistency, but now that we know about it, we can't stop thinking about it.

2 April Passes Her Board Exams In June, Yet Everyone Only Mentions It In October

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via TV Guide

How come April passes her board exams in June, yet everyone mentions it in October?

As a fan says on Reddit, "In season 10 April passes her boards 2 episodes before them and even though they both happen at the end of June, the residents don't talk about passing until the Halloween episode."

1 DeLuca Claims He's Never Been Around Children Much During The Custody Trial, Yet Mentions Later How He Comes From A Big Family With Lots Of Kids

deluca on grey's anatomy
via Pinterest

This Reddit post points out a huge inconsistency with DeLuca: He claims that he's never been around kids much during the custody trial. But, this isn't true at all because another time, he mentions coming from a big family where there are children.

Even though we didn't notice these plot holes and inconsistencies, we're totally in it for the long run. We'll be watching Grey's Anatomy until the final scene.

NEXT: 20 Surprising Facts About Grey’s Anatomy Star, Ellen Pompeo