Bike

0:00 - Echoes version has a bicycle bell ringing at the beginning! This is not present on any other version.
Throughout - The vocals seem to be horribly double-tracked, but they're not... it's artificial double-tracking (ADT), a tape effect, cranked up to an unhealthily high setting and hard-panned to an opposite point in the stereo image to make it seem like Syd did a completely different-sounding take when he double-tracked the lead vocal (an effective technique he uses on some of his other songs). Here, they simply ran out of tape tracks to use so they just plugged the vocal track into an ADT machine... and left it on even when the background vocals come in!
0:23-24, 0:47-0:48, 1:07-1:08, 1:29-1:31 - The drum crashes here are dropped into the backing track, rather than overdubbed. Causes drop-outs and clicks that are more obvious at some points than others.
1:25-1:27 - Scratches in the left channel, perhaps from the ADT machine?
1:38, 1:40 - Bass guitar in the left channel clicks twice on the same note
1:48-1:49 - Clicks as the ADT machine is switched off
2:50-3:04 - Lots of subtle clicks, close to centre
3:10-end - More obvious clicks and scratches on the right channel

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