When Lois buys a raffle ticket at the magazine stand, the comic books Superboy #44 (October 1955), Batman #95 (October 1955) and Superman #101 (November 1955) can be seen behind her.
When Bobby tells Dexter that he will never say anything and keep his promise to not tell anyone he s Superman, in every other scene, Bobby always blabs something to imply that he knows something about Dexter's identity.