When the Drac is sitting by the camp fire reading from his book, we see the open book for a few seconds. The page on the right is the same page as the left just upside down.
Zammis speaks as if English is a second language. Being a member of an alien species, it's possible that he might appear to have an "accent" because of differences in his physical vocal structures. But his vocabulary and syntax should be the same as that of Willis Davidge, his only teacher.
Young Zammis learns English as its native tongue, but speaks with an alien accent. There should be no accent except for the generic American English one with which it grew up learning to speak.
During the sequence where Davich is transported to the ER a Crew member is visible at the right corner.
Davidge refers to the meteorite shower as "meteors". Meteors burn up in the atmosphere. If it makes it to the ground, it's a meteorite.