Corrected entry: In the scene where Martin Brundle (Eric Stolz) is watching the video recordings of his father's telepod experiments, he comes across one where his father is being interviewed by someone just after he's successfully teleported himself across a room. When Seth Brundle actually did this in the first film he was alone (no press coverage or witnesses) and nobody else knew he'd done it because he forgot to tape it. Also he's speaking in a very clear, controlled voice on the tape even though the only reason he tried teleporting himself was because he was pissed drunk on champagne at the time.
Corrected entry: After discovering the hidden camera in his apartment, Martin breaks into the monitoring room and chances upon a recording of the infamous scene from the first film where a mutated Seth explains how a fly got into his telepod and was fused with him. Problem is, that particular scene wasn't actually recorded by any character in the first film so there's no 'in-story' way it could conveniently pop up here.