Other mistake: The entire Buddha structure had tip over onto its side yet the bowl and its pedestal inside the structure remained the right way up ready for Sydney and Nigel to come and find it.
Continuity mistake: Sydney and Nigel are talking with Robert Blaine at the beginning of the episode. When he mentions the Nepalese people there's a close-up on them. One student wearing a white T-shirt is walking up some steps - but in the next shot he is walking down other steps situated earlier in his path. A few seconds later, another flub with an extra; Nigel stops the museum curator just as an extra wearing white clothes enters the frame, but the person is gone in the sudden cut. (00:06:25)
Continuity mistake: When Sydney receives the bowl from Buddha in the flesh (of course she would) her hands are under it, but in the next shot they touch the rim. (00:40:40)
Continuity mistake: When shirtless Nigel knocks some rocks off the Buddha's exterior, he leans back with both arms spread. In the next shot, Tia Carrere's arm crosses with his, but he was on his own, at distance from her. (00:27:10)
Continuity mistake: When Nigel spots the skeleton inside the Buddha statue, in its close-up it is lit very differently compared to the rest of the scene. (00:29:30)
Revealing mistake: In Bodh Gaya, Sydney knocks out Stewie Harper with a straight punch of supreme cartoonish phoniness. (00:20:30)
Plot hole: Sydney is able to surmise from the artwork (we could also say from the writing, but her rival is one step ahead of her for 2/3 of the episode and it is established that he does not know the language) the precise location of the koi in Lumbini. The map is 150 years old, but there's no way even with a big stretch of imagination to buy that they both'd be able to pinpoint with such ease and certainty its location in the basement of a random building in the bustling market center of a town, that surely changed plenty during the past century and that does not bear any special landmark.
Factual error: On a lorry for Lumbini, Nigel comments about this being his first day of work. Even assuming that Nigel and Sydney met first thing in the morning and they just took off for a flight that was leaving for India really soon, it is a flight that takes 17-20 hours. Even considering the time difference between "the US" (the actual location is never specified) and Bangalore (closest hub to their Nepali destination), it is really a stretch, since it's impossible that he did not sleep during the flight, and of course it's just hilarious that they'd have a chat about it only after an intercontinental flight.