He went to the movies because he had no plans and was aimlessly walking around and the movie theater was there and cops were around. I know even come LNs disagree with me but I don't think there is any chance that Oswald thought he was getting out of the TSBD and didn't plan on what do do if he did. He had no plans and no place to go.
If he had plans to get away he would have brought his pistol with him and would not have needed to go back to the rooming house. How did he know the cops were not going to bust him at the rooming house? I don't think there is any way someone could shoot a President in front of all of those people and cops and think they are going to just walk out of that building. Plus if he had any real plans he would have kept more money.
I think this is exactly right. Except I don?t know any LNers who would disagree with you and say Oswald did have a plan for after the shooting. I think he did not expect to escape capture. He did not have any chance of shooting his way out of Dealey Plaza, so he did not bring a gun.
I don?t think he realized how hard it is to locate the source of a high gun shot. There is a tendency for people to assume the sound is coming from the same elevation they are at. Most people don?t look up when trying to locate the source of a sound. Owls can locate sounds in 3-D but we are better at locating sounds in 2-D, when the source is at the same elevation as us.
So I think Oswald was just putting distance between him and the boarding house, probably thinking about what to do next. Possibly try to catch a bus. Or maybe hop on a freight train. Who knows. He might not have decided yet when he was spotted by Officer Tippit, looking suspicious in some manner.