Attached below are two different spelling errors.
Heracleia RIC.90 (18mm-2.5g) : Permutation of two letters.
Constantinople RIC.52c (20mm-3.2g) : Wrong letter.
those are great examples. below is a CONSANTINVS (missing first T) from Heraclea currently for sale on eBay. Maybe a little pricey at $195, but neat.
Nice example ! But really over priced in my opinion.
Eastern mints were more familiarized with Greek so, spelling errors with latin legends occured more frequently.
The best example I had in hand (not in my trays anymore) was not really a spelling error but more a "mixing" error with Antioch RIC.63 series (may be I have already post in other topic).
Neat examples, I particularly like the last one you post GPR.
Maybe the celator went for a liquid lunch and hey presto we have Valentini - sivs, blame the drink :o
here's an example that I have posted before. CONSTANTINS from trier
Great find, minting/engraving errors from Trier must be very rare, despite (or due to) the huge quantity of coins that have been minted it was probably, at that time, one of the most organized mint.