There's a little gap at the bottom left and if I tug on the trim, it's loose and hollow. I can hear road noise coming in from behind it.
I just wanted to check if it's safe to caulk here before I fill that gap with a strip of foam, then caulk it off. Ie if there's any purpose to the trim being loose that I'm unaware of.
Edit: this is the interior.
If it's your house, you can put your caulk anywhere.