The character who Lois and Clark visit while investigating the pranks is named Randall Loomis. His last name is an allusion to the Prankster's real name in the comics, Oswald Loomis.
When Lois enters into the Daily Planet and is given the paper, she turns to the sports section to see her face on the billboard of a jumbotron. The billboard and stadium are Camden Yards in Baltimore, MD, home of the Orioles.
When Lois is afraid of staying home alone, she comes to Clark with Lethal Weapon (1987), Lethal Weapon 2 (1989) and Lethal Weapon 3 (1992) on tape and they watch the first one. All three films were directed by Richard Donner, the director of Superman (1978) and the initial director of Superman II (1980).