When you’re watching TV, you expect there to be a certain level of professionalism and attention to detail, but the truth is, everyone is human – which is exactly how you get mistakes like these.

That said, it’s still a business, so someone’s head probably rolled because these errors are pretty egregious – and downright impossible to forget once you’re aware of them. So this is your warning: turn back now if you want to keep a clean slate!

13. The O.C. characters might have been a bit behind.

The main characters on The O.C. did their junior year of high school twice (seasons 1 and 2) and it was never acknowledged. —shannona4f5e1d132

12. Time travel on That 70’s show?

The timeline of That ’70s show is from May 17, 1976 to December 31, 1979. However, all eight seasons had a holiday episode which implied another year had passed. —echam4

11. Nothing takes you out of a scene faster than a microphone.

In Season 1, Episode 16 of Gilmore Girls, Lorelei and Rory were talking in the kitchen and a mic dropped into the screen right above the fridge. —j_call1209

10. Wow, she really got better fast.

In the last season of Jane the Virgin, Petra’s mother was in the hospital wearing a breathing mask in one shot and then it was gone in the next. —jamayap

9. Well that definitely needs to be investigated.

And in Family Matters, the youngest daughter Judy Winslow was last seen as the flower girl at her grandmother’s wedding in Season 4. For the rest of the show, the Winslows acted as if they only had ever had two children instead of three. —jmc289

8. Pretty Little Liars had some timeline…issues.

In Pretty Little Liars their senior year halloween episode was season three episode 13. Their senior year Thanksgiving episode where Mona died wasn’t until season five episode 12. So according to this timeline, all those episodes between season three and season five happened in four weeks.  —ashleys4dd1f0e47

7. Pretty Little Liars again. Oops.

In an episode of Pretty Little Liars, Aria answered her phone and it was clearly upside down. —madisong43ff5927f

6. Rose dated the same man (different name) twice on The Golden Girls.

On Golden Girls, Harold Gould played two different characters. In Season 1 he played Rose’s boyfriend, Arnie…And in Season 5 through the end of the show, he played Miles, a professor Rose dates. —khloebare

5. I thought it was just another person with their smartphone.

During a fight scene between Weevil and Logan from Veronica Mars, a camera operator’s elbow can clearly be seen. —brendag4d69211a5

4. Chandler was pretty forgettable in Friends.

Rachel met Chandler three separate times on Friends and they never remembered each other. The first was when they met while Rachel was in high school and they kissed at a party…… And then they met again in a bar during a flashback episode when Rachel is engaged to Barry……And they meet again in the pilot when Rachel runs into the cafe in her wedding dress. —alisonc477fcd75d

3. RIP Tina?

On That ’70s Show, Donna had a younger sister, Tina, that made an appearance once in the first season. Later in the show, Donna was referred to as an only child. —fritzmariak

2. I’m not sure if this is a brilliant or lazy way to fix a mistake.

During a scene in Twin Peaks, Frank Silva, a set dresser, accidentally appeared in the mirror’s reflection. David Lynch decided to keep it in and casted Silva as the creepy Bob. —brentus86

1. They don’t even go here.

In the Vitamin D episode of Glee, the girls from the New Directions had to compete through song against the boys. When the girls were getting the vitamins from Terri there were two extra girls standing with them who were not in the New Directions or in their performance. —haylimarie1229

I never noticed some of these, which is pretty funny in and of itself.

Do things like this bother you? Would you have noticed on your own? Let’s chat about it in the comments!

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