Beyond iTunes: Subtle Licensing Traps for Indie Festival Runs?

Hey everyone, I'm an editor working on a short film shot on a Pocket Cinema Camera 6K G2, lit primarily with an Amaran 150c and a few PavoTube II 30X. We're looking at festival submissions soon, and I've been poring over advice on rights and clearances. I keep seeing warnings about the 'assumed rights' trap, you know, buying a song on iTunes and thinking you own the sync rights. That's clear enough. But for festival-only rights, what's a more subtle, less obvious licensing mistake that indie filmmakers often stumble into? I'm talking about the kind of thing that wouldn't immediately scream 'problem,' but could cause headaches down the line if the film gains traction. We’ve been careful with our dialogue recorded on an MKH 50, making sure all our actors signed releases, but I'm worried about blind spots elsewhere. Any insights would be hugely appreciated.