It's definitely interesting to compare the movie with the series. There are definitely a lot of interesting continuity changes.
Yeah ... the first one being, "What language is everybody speaking?" In the movie, none of the Abydonians speak English. As of the beginning of the series, they apparently do. Well, that's easy enough to explain — during Daniel's exile there, he taught them. But that leads straight into the age-old question, "So why does everyone else in the galaxy now speak English too?"
We can envision that the language of the Goa'uld (and the Jaffa, and the Abydonians) is some sort of galactic trade language that everyone speaks. If the Goa'uld distributed it centuries ago when their power was greater, then you'd find it now even on worlds that they no longer rule.
At the beginning of the series, two members of SG-1 already spoke it, Daniel and Teal'c. Immediately after "Children of the Gods" it's not hard to envision the two of them drilling O'Neill and Carter in that language and getting them reasonably fluent. So for every offworld encounter after that, we just assume there's an implicit translation not shown onscreen. Except when on Earth (or talking amongst themselves), they're
not talking English, they're speaking in the Goa'uld Trade Language.
That covers about 90% of the language problem for the first half of the show, though there are still some exceptions; e.g. "how would O'Neill and Teal'c understand each other when they first met in CotG?" or "what language does Bra'tac use when he talks directly to 'Hammond of Texas'?" And in later seasons I believe it's a lot less plausible. Still, the handwave is there if anyone likes it.
Or, translator microbes inserted by the Stargate. Whatever floats your boat.