A320 legacy FMGC retention of previous VAPP in secondary flight plan.
Here's a good one which I have seen several times and which could catch someone out badly one day. If the previous flight has had the VAPP increased for any reason in an A320 with the of style "legacy" FMGCs and the active flight plan has been copied into the secondary, sometimes it can retain the selected VAPP on the next flight in the secondary flight plan. It should be checked, but one day it will be missed.