Wobbly sets is a must for a seriously good sitcom. No wobble, no great accolades or lasting memories. References to the Magna Carta are sadly lacking these days as are quotes from G B Shaw, both are glaring symptoms of the current malaise in scriptwriting. No great script, no great sitcom, regardless of how whacky your characters are.
Most of the others are very good practices too but I'd say optional depending on your sitcom. I will take issue with the home or workplace one - location is a trifle, the home is the ultra safe choice always, as is the office, and many workplaces are treated like home in sitcoms with virtually no challenging conflicts from the settings. The locations and the sets then made could be a lot more inventive and characterful, we're getting back to that obligatory wobble. I'll add as desirables
a good catchy theme tune that lasts more than eight seconds
over running episode lengths that holds the news up
unadulterated studio laughter with at least one looney or drunk in audience