Near the beginning of the film, there is a shot of the Belasco Theatre in New York, where Sidalee's play is about to start performances. The Main marquee and windows on the theatre display the marquee for her play. However, one of the marquees over the entrance has a general marquee that reads "See a Broadway show just for the fun of it!". The Shubert Organization (which owns the theatre) only uses these generic marquees in a theatre that is currently empty and no upcoming show is booked into it. This marquee would never appear on a theatre that is in previews/has a show about to open.
When the teenage Ya-Yas are going to Vivi's bedroom after the birthday party scene, they pass Buggy's room. When Vivi stops to watch Buggy, Teensy bumps into her coming up the stairs. There's a close up of Buggy, and then the camera cuts back to Vivi. Teensy comes up the stairs again and bumps into her.