Things you may not have noticed (spoilers ahoy!)

[Sleepbug]

Some more stuff found in Simon's apartment:
On the back of the Massive Recoil box part of the small text says it's produced by "Some Company Inc."
The text on the tracer fluid bottle says Simon is 27, which actually doesn't match either of his birthdates mentioned in game. Guess we'll never figure out his real birthdate.

Not an in-game finding but still pretty neat: in SOMA\music\00_00 a file named "00_00_ringtone" can be found, which is a portion of the Penumbra tech demo theme modified as... well... a ringtone.