In the second half of the film, Allison (Aubrey Plaza) is sitting in a chair and casually flashes her panties as she repositions her dress. The panties she's wearing are white. Then later on, when she is coming on to Baako (Grantham Coleman) she takes off the same dress and is now wearing black panties. There was no indication of a wardrobe change between these two scenes.
In the second half of the film, that is, in the second film, Aubrey's character completely downs a clear glass of whisky/scotch liquor. The camera cuts to the male in the scene and he says something, then back to Aubrey's character who again completely downs the same glass.
At the 20:30 min mark, when Blair (Sarah Gordon) is teaching the foxtrot to Allison (Aubrey Plaza), Blair says, "I guess I'll be the guy" but she proceeds to align them (with her right hand elevated, left hand on Allison's shoulder) as if she were the female partner.