Maybe name mix up in first PA if you remember the name as the first officer but he later introduced himself as captain.
I think that is what it was. The original PA from the captain was a bit repetitive: he explained the importance of the safety briefing more than once. which gave me the impression he might have been recently promoted etc. etc. To be clear: I absolutely do not mean that as a criticism, it is just an observation.
Anyway, will never know the actual configuration on that day, but is all very interesting stuff!
Nick