The replacement Jeff didn't match up to the orignal Jeff very well
The original actor who played Jeff the cab driver felt very confident, very demanding and seemed like somewhat of a threat with how he was essentially making Saul dance like a puppet for his amusement by making him say the better call saul line.
Then Pat Healy who doesn't resemble the original actor AT ALL btw, plays him as some awkward bumbling mommas boy, that Saul could boss around, i dunno it just didn't feel at all like the same character to me.