Corgan's desire for musical perfection put further strain on the already-frayed relationships between the band members. Vig later recalled, "D'arcy would lock herself in the bathroom, James wouldn't say anything, or Billy would lock himself in the control room". Corgan often overdubbed Iha's and Wretzky's parts with his own playing. Wretzky stated that Corgan only performed most of the guitar and bass parts because he could lay them down more easily in recording and with far fewer takes. Stories of the album's recording had circulated in the music press. Corgan admitted there was some truth to accusations of tyrannical behavior, though he felt the press misunderstood the situation.

While Chamberlin performed all drum parts on the album, he would disappear for days on drug benders that caused everyone to fear for his life. After one incident where the drummer had disappeared for two or three days, Corgan "put the hammer down", according to Vig, and had Chamberlin perform the drum part for "Cherub Rock" until his hands bled. Due to Corgan's urging, Chamberlin checked into a rehab clinic. Corgan told Spin later that year, "You know, I gave them a year and a half to prepare for this record... I'm surrounded by these people who I care about very much, yet they continue to keep failing me." Corgan explained that he began to take the actions of others personally; he said, "If you really think about it, of course, someone doesn't do the job because they're lazy, or they don't think it's important. But I took it as, 'You're not worth going home and working on the song.'"
Did Billy Corgan really play all of the instruments on Smashing Pumpkin's 1993 album "Siamese Dream"?
No. Jimmy Chamberlin recorded all of the drum parts. However, Billy Corgan often overdubbed the guitar and bass parts with his own playing.