There was. Ilana says she farted early in the episode, then her and her boyfriend fart in their taxi or uber, and have to put their heads out the window. And at the end, Ilana says she broke her boyfriend's toilet. She also says she's a gassy girl at dinner.
When I saw the trailer for Happy Death Day 2U I was astonished, I was just rewatching the fart scene in the first movie hours prior, after a lot of time that I had forgotten about it.
I would say "I hope there is going to be a scene like that in the sequel" but that's so unlikely that I won't even consider it.
Firstly because it was very situational and has low chances of being a running joke, secondly because I've seen many reviews actually point at that scene as the biggest example of moments where the humor falls flat.
Which sucks, if people thought it was funnier we might have gotten our chances up... oh well, at least the one in the first movie will remain in history as one amazing fart scene, for us.
"Sweet God, what have you eaten today?! No wait, don't say it, let me find out my way..."
I saw the movie and no farts are in it :/