Omg yes it was weird! It fit when I saw them at Shepherds Bush because the show was already weird (the band came on late which we now know was because their people wanted to call off the show and send Billie to rehab, finally Tre came out and opened by playing All By Myself, Billie got booed for singing Hey Jude as a joke he wasn't in on because Paul McCartney had recently got bad reviews for a performance of it, it was extremely hot and the pit was absolutely crazy, my sister passed out at one point - but insisted on rejoining the crowd after a few minutes, they played new trilogy songs I hadn't heard yet, a "wall of death" took up almost the entire floor of the small theatre during American Idiot).
When they just played 99 Revolutions and left without that "cool down" you usually get from Good Riddance it was like, the craziness just suddenly stopped and you felt like "now what?". It was surreal. It was actually the perfect end to that particular show but I'm glad they brought it back.