The Big Bang Theory is one of the best sitcoms of all time and, even though it ended seven years ago, it remains firmly in the public's consciousness. Personally, I wouldn't change much about the 12-season show, but there were plenty of creative alterations made before and while the series was airing. Certain scenes had to be cut for time, while other storylines simply didn’t get to see the light of day because of other reasons. Apparently, there was even a Sheldon scene that was discarded, and I think this would've been great.
Brian Thomas Smith, who played Penny’s on-again-off-again boyfriend Zack in the beloved CBS sitcom, appeared on The Official Big Bang Theory Podcast, where he shared some more BTS stories about Big Bang. The actor made his debut as Zack at the end of Season 3 and returned for a few episodes in Season 4. Interestingly, Smith revealed there was a Season 4 episode he was supposed to appear in with a storyline involving Sheldon, but it didn't come to fruition for an unfortunate reason:
