2. What happened to Jeff the taxi driver who harassed "Gene" at the beginning of Season 5 (i.e. did Saul/Jimmy/Gene "fix it" himself)?
From Quiz "Better Call Saul" - What Happened To Everyone?
Answer:
"Gene" joined forces with Jeff to pull scams
"Gene" tricked Jeff's mother Marion (played by the famous Carol Burnett) into letting him into their home. He then "befriended" Jeff and Buddy (the other guy at the mall that day in Season 5 Episode 1). He arranged for Jeff to sneak into the mall one night, avoid security, and steal lots of expensive clothes (and lingerie - but we're not here to judge).
When the three comedians...er, I mean accomplices were gloating over the merchandise in Jeff's mother's garage, Gene threatened them. He told them how much jail time they'd get if they informed on him and/or bothered him again. They had to grudgingly swear "We're done."
But, soon after, Gene contacted them again. He found he had missed "the game" too much. They worked on a new scam together. Photographing ID cards, credit cards, etc, and selling to an unnamed "gentleman". Jimmy McGill was still clearly addicted to crime after all this time.
To be honest, I would have expected the black and white Omaha scenes to change to colour at this point. B & W was meant to represent Saul's misery hiding from the police, not able to enjoy crime anymore, living in hell, a boring job, etc. So logically, a return to his element would warrant a return to colour. Wouldn't it?