Steve's Beatles Page can tell you things you never knew about Beatles' songs. For example, in "I Want You (She's So Heavy)", at 3m, 37s there's a "Fluffed bass note"; and at 2m, 47s in "Ticket to Ride", the "First bass note in double time ending is quite sharp"; and in "Norweigan Wood", from 2:01 to 2:08, the "song slows from 118 bpm to 109 bpm, and stays like that."

I checked a few of them and was surprised I'd never heard them before; they can be pretty obvious.