User blog comment:WarAeagleU27/Problem with Stan Lee's cameo in GOTG Vol 2/@comment-26917787-20170515225137

This has already been addressed by James Gunn. He knows he made a mistake, but this cameo could refer to any number of other times Stan Lee was a FedEx Guy.

There was a list of potential lines, with mentioned being a "DJ in a stripclub" one of them, referring to his cameo in Deadpool. Of course, they settled on the Civil War cameo, but in my opinion that would have made things more interesting.