Dennis Looks Like a Registered Sex Offender - S3-E11
Continuity mistake: After Mac's dad crosses the first name off the list, he folds the paper back up and caps the sharpie. In the next shot, he's folding the paper and capping the sharpie again.
It's Always Sunny in Philadelphia (2005)
1 continuity mistake in Dennis Looks Like a Registered Sex Offender
Starring: Danny DeVito, Charlie Day, Glenn Howerton, Kaitlin Olson, Rob McElhenney
Genres: Comedy
Continuity mistake: As Charlie enters the bar Dennis is writing a sign that says: "Carmine's A Place for Steaks." A shot later and the sign is unfinished, with the words, "Carmine's A Place..." The words "for Steaks" are not on the sign.
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.
The Gang Gets Held Hostage - S3-E4
Trivia: When Frank pulls out the gun on the roof, he says "Yippee-ki-yay Mr. Falcon", a nod to Die Hard 2, the TV version of which infamously had the word "motherfucker" badly dubbed over with "Mr. Falcon."
Bums: Making a Mess All Over the City - S3-E14
Question: Does the junkyard cat actually belong to one of the actors or is that a whole different deal?