The No. 7
I just re watched parts 1 and 2 for the first time since the original airing. So good!
Something that I noticed was the significance of the no. 7.
The coffee cups that Tracey and Sam were drinking from both had the no. 7 written on it .
Chantelles motel room was no. 7 .
The arm clearly says "257 time and time again (although the subtitles say 253, so 7 is missing).
I'm sure I missed out more instances, but I thought these were interesting.