Murder on the Day of the Dead - S7-E5
Audio problem: The address on the satnav is 35 Rue Dauphin, but Ardal O'Hanlon says 35 Rue D'Orphan (the close captions say as much too, it's not a personal interpretation). Florence correctly types Dauphin. (00:35:00)
Murder on the Day of the Dead - S7-E5
Audio problem: When Jack and Florence talk to the club treasurer drinking lemonade, several times in shots where Ardal O'Hanlon is out of focus in the foreground you can hear his voice being dubbed in while he was doing simple a stand-in role without opening his mouth. (00:26:20)
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
raywest ★
As long as such changes aren't an obvious continuity mistake (e.g. changing multiple times during a day), one can just assume the change happened in-universe as well. Things do get broken or updated occasionally. It adds a bit of realism, in my opinion.