During the recording, Cropper learned that his girlfriend was pregnant and began acting erratically. Weezer collaborator Karl Koch said: "He wasn't handling it well ... he always said he was fine, and then 20 minutes later he'd be up on the roof of Electric Lady screaming or something." According to Cropper, Cuomo told him he could not allow him to jeopardize the work and asked him to leave. In 2014, Cropper said Cuomo had made the right decision. Cropper was replaced by Brian Bell. While Bell's vocals appear on some tracks, Cuomo re-recorded all of Cropper's guitar parts. Ocasek recalled: "After album was completely recorded, Rivers came in and said, 'I’m firing the guitar player, and I’m going to do all his guitar parts over.' I said, 'You can’t do that!' But he did. In one take." Bell is still credited for playing guitar in the liner notes. Cropper received a credit on "My Name Is Jonas" for writing the intro.