PlayStation 3
Controllers
DualShock 3 controllers cannot be charged with generic USB chargers. If you have a "dead" controller, try plugging it into the running PS3 console and leaving for a few hours.
PlayStation 1 Emulation
If you have a game in CUE/BIN format, converting it to ISO format might break it. Confirmed with Crash Team Racing
Save file lock-in
While original firmware allows copying save files to/from USB drive (no need for paid subscription) the saves are:
- tied to a specific build/region of the game
- tied to a specific account
Evilnat Custom Firmware includes a tool to change save file ownership, but you still need a matching build/region of the game to load them.