When Molly wakes Pat up at 11:30 to get to a noon rehearsal, Pat throws the bed covers off herself twice.
When Molly gets on the bus heading back home to Nebraska, as the bus pulls out of the station, you can see the names of various cities printed on the trimming plus a simple Greyhound logo on the side. But in the next shot of the bus out on the NYC streets, the bus has now changed its look. It has a fancier "Greyhound" logo, there are fewer cities printed and the names of the city have changed.
While Eddie and Pat are rehearsing in the apartment, Jed Marlowe walks in without ringing the doorbell. Now if Eddie who is Molly's fiancé, had to ring the bell what gives Jed - a former acquaintance of Molly and Eddie - the right to feel comfortable enough to enter someone else's apartment without ringing the doorbell. Additionally, this is his first time at the apartment and he didn't know that Pat is Molly's sister. It doesn't make any sense and at this point, it disrupts the flow of the story.