Executive Meddling: Eric was originally slated to die, just like his counterpart in Timeranger. The writers were skeptical that Fox Kids would allow this, so they filmed two versions of the scene: one where he died, and one where he lived. Fox Kids, as expected) vetoed the death. It worked out for the better, considering his performances in his two teamup appearances
Also, the originally planned ending had Jen staying in 2001 with Wes to keep the recurring theme going. But due to this trope this was thrown out the window, resulting in executive producer Judd Lynn quitting the show.
The team-up in the next season did have Jen return to the present, though it's never stated one way or the other whether she stayed this time.
Fearhog is voiced by David Stenstrom, who voiced King Mondo and portrayed Hal.
Talking to Himself: Alex and Wes, both played by Jason Faunt. Justified as they're descendants of each other. Exactly what the relation is unknown.
Too Soon: As a series that regularly involves lots of property damage, it is believed that there was a lot of editing that invoked the trope after 9/11.
What Could Have Been: The writers of Time Force originally planned out a series where the Rangers travelled through time and fought across different time periods. Then they discovered that Mirai Sentai Timeranger didn't actually feature the characters actively travelling through time: they travel once to the year 2000AD and stay there. The writers would later indulge their desires for historical crimefighting in the two-part Trapped In Movie Land episode "Movie Madness", scenes from which would later be spliced into the opening sequence to imply that... yes, the Rangers actively travelled through time and fought across different time periods!
According to Daniel Southworth at Power Morphicon 2007, due to the popularity, and the relationship between the production crew and cast they almost came back for a second season - whether he meant a second season of Time Force, or the characters coming back in Power Rangers Wild Force is unknown.