I still say at the 15 second mark you hear a turn signal indicating he's turning right onto TTL, and at 1:09 you hear him putting his vehicle into park.
The sound at the 15 second mark (16 second for my .WAV file), for my money, is his windshield wipers, on an intermittent delay. The exact same sound (maybe ever so slightly magnified) is heard at the 1:00 mark. It's heard again at the 1:16 mark. I think I hear it again at the 1:53/1:54 mark. I think I may also hear it at the 0:30/0:31 second mark, but Noffke's voice is drowning it out. I was trying to time the delay between the sounds, to get a set interval in seconds. It seems they're mostly 15 seconds apart, but the one I think I hear at 1:53/1:54 puts that timing off.