That might be the only continuity error? And even then he’s pulling jailbreaking tools out of his boot as he says it, so I’m thinking the “first” he’s referring to might be the TYPE of prison he’s in, not prison in general?
Good point, and with how well they danced around the Star Wars: Rebels canon with Mon Mothma in S02E09, I have a feeling the team did a very thorough job making sure they didn’t contradict anything in Rogue One.