Here are some of mine:
- forms with mandatory fields that shouldn't be mandatory (I didn't do an SQE prep course, stop asking me)
- errors in underlying data feeds that the suppliers refuse to fix (e.g., missing schools)
- brittle in-house application systems which ask lots of questions but flake out during submission
- third-party application systems that have you re-enter identical data for multiple firms
- ridiculous recruitment games testing sub <100ms reaction times and claiming this represents your ability to work under pressure
- spelling mistakes and other errors in the third-party recruitment tests
- having all 3000 applicants go through multiple involved stages of computerised application before a human even looks at it
- not replying to applications at all, or till after the relevant date (e.g., the vacation scheme start date)
- seeing the same right/wrong test questions being used for multiple law firms
- zero feedback/indication of whether you passed or failed the computerised test