I'm not sure whether those counts are accurate or not. I'm also not sure I could estimate 1/8 cup of rice--that sounds like a measured tablespoon full.
How much of the vegetable mixture did you have? 1 cup?
Even sauces that don't taste sweet often have sugar in them, and they do have oil. And expect to retain water from the salt.
It's tricky to eat at Chinese/oriental restaurants. I tend to avoid them, or I get steamed, grilled, or baked items without sauce.
Probably you're OK estimating 400 cals, but I'd say you wouldn't want to go there frequently while on your weight loss plan.
Jay