The other big point made in this show was that Jesus' entry into Jerusalem must have been not at Passover in spring, but during the Feast of Tabernacles in autumn, as that's the celebration for which palm branches were harvested en masse. Then, supposedly, after Jesus was arrested (because his purported backer Sejanus had been executed), he was kept in prison for up to six months and then crucified at Passover, which explains why the crowd turned against him apparently so soon after his triumphal entry — his execution was six months after "Palm Sunday", not a few days, and so by then he'd been rejected by the people as just another false Messiah.
As a couple of others here have indicated, palm branches could very well have been cut and waved on other occasions. There's a good website
here that disputes the claim that the palm branches mean it must have been the Feast of Tabernacles and not Passover: "In the lifetime of Jesus, waving palm fronds had become an instantly recognized Jewish national symbol." So it makes perfect sense that the crowd would have cut them and waved them to honour the Messiah, regardless of the time of year.
It's interesting to note that only John's Gospel specifies that the crowd "took branches of
palm trees" (John 12:13 — Matthew and Mark simply say "cut down branches from the trees" (Matthew 21:8, Mark 11:8); Luke's account doesn't mention branches). But more tellingly, John is the only Gospel writer who describes Jesus visiting Jerusalem several times during his ministry, and most of those times, he specifies which festival it was for. In John 7:2 we're told plainly "the Jews'
feast of tabernacles was at hand" (to which Jesus goes secretly). John obviously knew very well when the Feast of Tabernacles was and when Passover was. So it doesn't make any sense that he would describe Jesus' triumphal entry into Jerusalem, with the crowd waving palm branches, as being at Passover if it had been Tabernacles!
The other part of this theory is even more of a stretch to believe — that Jesus was kept in prison for up to six months before being executed. Leaving aside the fact that if Peter and Paul and the other apostles could all walk out of prisons free (Acts 5:17-20; Acts 12:1-11; Acts 16:22-26), their Lord and Master most definitely could have... if Jesus
had been imprisoned for several months at the height of his popularity, why on earth would absolutely no-one remember that and pass it on when the Gospels were being written?? Again, it's a theory without a skerrick of evidence for it and rather a lot against it.
Hope no-one minds me doing such long posts here... I just felt it was worth sharing some straightforward rebuttals to
The Last Days of Jesus, since inevitably there'll be people who've watched it and assumed "Oh, it's all from serious scholars, so it must be true..." However slickly presented it all was, those theories are actually full of holes you could ride a camel through.