Many thanks to one of my readers who brought this to my attention!
Back in 2014 Alex Winter was on Kevin Pollak’s Chat Show. The entire episode is on youtube and was a very good watch. Around the 41:00 mark, Alex was asked about Bill & Ted. In addition to talking about B&T3, Alex talked about the history of the other B&T films. He also talks about his and Keanu’s auditioning for B&T back in the day and how they became friends. Also, Keanu is moody according to Alex.