Back at the bar after Maurice left the room, there are four empty glasses and Myrtle pours a whiskey in the front right one (from her position). After the cut, she finishes pouring the front left glass, while the right one is also filled.
In the beginning of her New York play, Myrtle is so drunk she can barely stand up on the stage but after the second act she's perfectly sober, perfectly able to move around and also improvise which a heavily drunk person wouldn't be able to do.
Myrtle walks from the bar towards Maurice with a glass of whiskey, but he declines and leaves the room. The long shot still shows her holding the glass in her left hand, but upon returning to the bar she holds no glass.
A bus rolls by the New Haven theater with an ad for KBIG FM 104, a Los Angeles station.