Despite exhausting a powder-type fire extinguisher inside her car only moments before, when Dex is driving to, and later departing from the 'meet up' site, there is no evidence of residue to be seen inside her car.
When Dex is driving off after learning where the exchange takes place, she has to stop for a MAX train. The train she stops for is two Type 300 trains, but the end of the train that passes on the next shot before she drives off is a Type 200 train.