It's Always Sunny in Philadelphia
It's Always Sunny in Philadelphia mistake picture

The Gang Gets Held Hostage - S3-E4

Revealing mistake: When Liam is stabbed in the arm, as he turns around to walk away, you can see the outline of his real arm wrapped behind his back, under his robe for about one full second, revealing that the arm he was stabbed in was a fake prop-arm.

TedStixon

More mistakes in It's Always Sunny in Philadelphia

Frank Reynolds: We gotta definitely write a song about how we do not diddle kids! "Do not diddle kids, it's no good diddling kids."
Mac: There is no quicker way for people to think that you are diddling kids than by writing a song about it.

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