The Wormhole wrote:
Yeah, it seems SG-1 mucking around with the timeline has changed O'Neill's pond from lacking fish to now having fish. This was intended to be a reference to the Simpsons Halloween episode where Homer is constantly changing the timeline with a time-travelling toaster and in the end settles for a timeline close to the original (or "Prime" to use Star Trek terminology) except everyone has snake tongues, which Homer just shrugs off as "close enough."
There was a Wolverine comic from the early '90s which featured Logan and Lady Deathstrike dueling through different time periods, while Donald Pierce monitored the present to make sure they didn't mess up the timestream too badly. (Why he was immune to the changes wasn't explained.) At the end, Pierce assesses the damage to the timestream and says, "Aw, they won't miss that fifth Ninja Turtle anyway."