The Santa Clause 4 will see Charlie getting married and having him deal with telling his fiance that his dad is Santa Claus.
The elves in this movie are child vampires of the Twilight variety.
The names of the eight main reindeer (Dasher, Dancer, Prancer, etc.) aren't names...
Scott killed Santa for good.
The original Santa killed himself.
The Original Santa used the Escape Clause.He went back in time because he thought he could retire, and he chose someone who had no problem taking his job.
The original Santa is the Santa Claus The Movie Santa.He's been doing this for centuries and thought maybe by this movie he should use the Escape Clause and retire with his wife.
The original Santa is not The True Original Santa.That Santa would have been the original Saint Nicholas. The Santa that died/disappeared falling off the roof had replaced one that had been around earlier, who'd replaced the one before that, who'd replaced the one before... and so on and on all the way back to Saint Nick himself. Presumably each Santa lasts for decades, even centuries, until he no longer can do so, and someone new finds the card and suit, stepping into the position of being Santa. No doubt this might be something arraigned by the original Saint Nick, a perk of being a saint.