Audio problem: When Phil is playing the piano with the jazz group, we hear three glissandos (dragging of the fingers over the keys starting from high to low), yet we see his hands only do one. We hear the first two happen while we see his hands playing something different.
Audio problem: When Phil is dressed as an outlaw and pretending to be "Bronco" his Clint Eastwood impression voice is out of sync with his lips.
Audio problem: At the party when Phil is playing the piano, there are several shots of the other band members. Multiple times they are seen playing their instruments, but they are never heard. The most obvious example is right before Phil finishes up his set. The saxophone guy is playing but you never hear it.
Audio problem: When Phil is building his final snowman, Rita says, "Why can't I look?" but her mouth does not move. (01:32:50)
Chosen answer: As you stated, it's never addressed as to whether or not he attempted to leave town. Phil lived through many more days than is shown in the film, so it's possible he left at some point, though there's little reason for him to do so because he wouldn't get far, and, when he wakes up the next morning, he'll be right back in the town.
raywest ★