1. We see what looks like a Yeti footprint at thd beginning and then it's forgotten. Oh well, for a later series.
Rather, it was explained as probably just a human footprint made to look bigger by the snow melting. Since it was still trying to be a science/educational show at this point.
3. This seems more of a Marco Polo series than Doctor Who. The Doctor iz more of a bit player. He basically sleeps through episode 2.
At this point, Ian, Barbara, and Susan were still seen as the lead characters. The Doctor was the mysterious figure who was the catalyst for their adventures, as likely to create trouble for them as to get them out of it.
7. Why does the Doctor risk (and temporarily lose) the Tardis in a backgammon game ?
Creating trouble, as I said. His hubris was such that he gambled unwisely.