When Rick and Taylor return from the bar, and before going to bed, Rick pours 2 glasses of alcohol before going upstairs. He pours less than an ounce of so in each, but when he enters the room seconds later, both glasses are almost half full.
When Fresno and his band are rehearsing, we hear a vibraphone in the background. Assuming the keyboard player is using a synthesizer, playing that sound (which is unlikely since the keyboard looks more like a Fender Rhodes electric piano, which produces quite a different sound), his hand and finger movements don't match the vibraphone notes that we hear.
When Rick is taking Taylor out on the town in Toronto to help him gain experience with women, initially they are driving northbound on Yonge Street, a few blocks north of Eglinton (as evidenced by the HMV location next to Toys 'R' Us; these two stores are part of the Yonge-Eglinton Centre). Shortly afterward, they are at a cafe called Il Gatto Nero, which is at College and Crawford, a few blocks east of Ossington - and several kilometres to the SOUTHwest of the Yonge and Eglinton area.