What irks you

I'll touch on a few, but I could go on and on...

Go-wings installed backwards.

Engine compartments painted black, unless car is black.

Incorrectly applied stripes, painted on or vinyl.

16" or larger wheels with rubber band tires.

Cutting out an original/reproduction performance hood, (example 69 340 Swinger/GTS hood), for tunnel ram or blower clearance. Plenty of flat hoods out there for that purpose.