Enforced Method Acting: In this version of the mythos, before Superman shows up, Lex Luthor is shown to be an adrenaline junkie, staring down cobras and punching out sharks. There was only enough money to film one of these scenes, and the snake wrangler evidently ate up the safety budget, so John Shea had to stare down a poisonous snake for real.
Executive Meddling: There were fights between the writers, the execs, and the fans as to whether Lois and Clark would tie the knot in the show. The results werenotpretty.
It also interfered with the comic book marriage which would have originally happened in 1992 but was postponed to coincide with the TV show marriage. The resulting gap in their story arc led Jerry Ordway (the then-current writer/penciller of The Adventures of Superman) to comment, "Why don't we just kill him?" The rest is history.
Genius Bonus: In the pilot, Clark crashes at the Hotel Apollo while he looks for work. The name is an intentional reference to his Superman persona. In Hellenistic times and especially in modern times, Apollo became identified as the god of the sun.
Method Acting: You wouldn't know it just from watching him, but John Shea took Lex Luthor very seriously. Not only did he study Nietzsche, but he checked himself into John Jay College of Criminal Justice in-character to get a diagnosis on 'his' pathology. It's a wonder they even let him out.