One thing that bugs me about this film (and TFA, as well) is the almost complete absence of OT and Prequel aliens.
I recognize that 1.) it's a big galaxy with a lot of sentient species; 2.) the filmmakers want to keep things fresh (and sell more toys); and 3.) they want to avoid the "Where's Waldo?" distraction of audiences constantly looking for alien callbacks instead of paying attention to the narrative.
However, for films that both try so very hard to tie back into OT, why are the Mon Cal, the Ponda Baba cameo and (maybe?) a Jawa in the Ring of Kafrene crowd all we see? It's like Rodians, Ithorians, Hutts, Twi'leks (no, Hera's paging in R1 doesn't count), Duros, Chevins, Bith, etc. never existed.
Again, I'm not saying they have to find a way to shove every OT/Prequel alien into the film, but a Rodian couldn't have been one of the Rebel pilots? We couldn't have seen a Duros or Twi'lek among the populace of Jedha?
A prime example, this guy:
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Moroff, a Gigoran, one of Saw's Partisans. If you wanted a big, strong, white hairy alien - why couldn't he have just been a Talz?