At youth (in particular), do everything you can to get the game on. Play and then report. Only thing really stopping me at OA and vets would be lack of shirt numbers (so no turning shirts inside out, bibs obscuring shirt numbers etc). Odd coloured shorts, mismatched / clashing socks... "guys, you're all wearing the same colour socks, so we can either wait for someone to go and get the right socks, or we can crack on and accept I'll make mistakes over who last played the ball". You can guarantee what their response to that will be. Obviously if the league is of a reasonable standard you're not likely to hit those problems.