This is the first time Shaggy mentions that he doesn't wear socks.
By the direction of the S.O.S. signal of the Scooby-Doo Detective Agency to Shaggy's parents, it seems like the Policemen Ball is held in a place located Eastwards than the Babysitter's home as the Rogerses had to look westwards to see it.
By the direction of the gang's movement by the end of the episode it seems that the Babysitter's home is located eastwards to the block where the Palace theater is.
Shaggy: (narration) Like, it was a dark and stormy night. Any horrible thing could happen. Including the worst—bad TV reception. But even that's no problem for a pup named Scooby-Doo. Scooby: (Scooby giggles as he acts as a TV antenna)
Scooby: Rone ricket, rease. (gives a dollar note to a ticket seller) Freddie: Hey, Scoob. That's not a scary movie. Scooby: (recieves ticket) Rexactly. (giggles) Shaggy: I guess Candy Land is a safer place for a pup named... Scooby: ...Scooby-Dooby-Doo!