A tiny microphone could be seen on some of the character's costumes at some points in the movie.
The bathroom would not have filled up with steam that fast. It would've taken at least 5 to 10 minutes for the hot shower to produce that much amount of steam instead of the seconds shown.
When Robyn is trapped in the garage and tries to get the garage door to open by pressing the buttons, it appears that she doesn't actually press them.