When Jane talks about surprising Steve in Prague and he starts to sit down, he closes his mouth. It then cuts to a close-up of Steve and his mouth is slightly open.
In the toilet stall, just before Jane gets undressed, her shoulders are hunched, then not. This happens twice.
At the end of the episode Susan is supposed to be showing the group her naked right breast. In one shot, you can see through her shirt and can tell that she is wearing a bra.
When Sally tells Susan she only smiles at single men, she smiles at Susan, who is not single nor a man.