ONly two I came across - In ADvanced find, if you try to filter on date ON a fixed date, you won't get any records returned. WOrkaround is to use BETWEEN and select records from 00:01 to 23:59 for the given date. HP reckon they'll fix in SP24 - You can't update Service and SLA custom fields in Service and SLA DB rules. There is a hot fix available from HP for this. (Not many users write DB rules on these entities, but I had a few that stopped working).
We migrated from SP17 to SP22 last week. Encountered an error towards the end of the Database (Oracle) Upgrade. The Upgrade worked but lost a few SC UI rules which we had to recreate. Spoke to HP Support and they provided a Delete script to remove some JAVAOBJECTS. Users report thus far is that SP22 is slower in general. The "Date On" Advance find issue reported by Ken seems to be for Mondays only, other days do return a result.