Plot hole: All three murder suspects claim to have seen a picture above the fridge of the hotel room. This picture however is only in the hotel room where the actual murder happened, not in the room that is shown in the video, so they couldn't have seen it.
Tanngrisnir
7th Sep 2014
Castle (2009)
13th Apr 2013
The Big Bang Theory (2007)
The Zarnecki Incursion - S4-E19
Plot hole: While it would certainly destroy the entire plot of the episode, Sheldon could have simply contacted Blizzard's customer support to get all his stuff back.
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: A character not doing something that they theoretically could have isn't a plot hole. It's simply something that didn't occur to them. Regardless, the plot isn't broken because he doesn't do it; in fact, the opposite: it's required that he doesn't for the plot to work. If anything, it's a plot hook.
14th Jun 2010
Stargate SG-1 (1997)
Disclosure - S6-E17
Plot hole: Senator Kinsey references the Foothold incident from season 3, yet only a few episodes before it was revealed that Kinsey could never have known about it because it was covered up under presidential orders and he especially was not in on it.