You are a disgrace to the forum
Main things to look for I'd say:
Corrosion, usual spots are bottom of doors, roof rails and front arches quite poor for a car that's meant to be galvanised that's another debate...
Haldex (Quattro)wiring issues or noises, skipping when on full lock. Due to poor servicing mainly.
Rear wiper motor or washer jet being intermittent or not working.
Wear on leather bolsters
Stock head units can have a fault when volume is adjusted even slightly can make the speaker volume on max all the time.
Wear on switch gear for example headlight controls and climate control the paint just comes off and looks terrible some cars are worse than others some are perfect.
Chrome trim around gear knob can chip and flake off
Broken glovebox hinges
Previous owners covering warning symbols on instrument clusters to hide ESP errors for example. (Happened to me)
Brake servos are known to be a weak point.
broken springs suspension.
Alarm siren fails and the warning for this is beeping on startup
instrument cluster the LCD screen in the middle starts to gets line and becomes hard to read.