When Bernadette is first seen sitting inside Halley's playhouse, she is on the phone with Howard and there is nothing seen behind her. In the next shot behind her we can see a floral curtain.
The crows at the end flying on top of the boys' car are all wearing neon green rings around their legs, indicating that these aren't wild crows at all, but animal actors, although they are said to be the crows of the female researcher who lost out on the grant money.