When Bree gets stuck in the department store's gate, the close up shots of the lock at the top show the gates closer together than they could possibly be with Bree wedged between them.
When Mr. Beale throws a pencil into his mug, the pencil can be seen on his desk in the shot immediately afterwards.
Veronica's son's lip movements do not match when he tells her that he's thirsty.
When Deanna is leaving the Solis House, the boom mic is reflected in the car window.
When Gaby learns that she and Carlos have been rejected as adoptive parents because of their Mexican ancestry, Gaby exclaims that if they show how much money both of them actually make that they are going to look "a whole lot whiter," implying that Mexicans are a non-White race. Mexicans are not a race, but a nationality, and just like many other Spanish, French or Portuguese-speaking Latino Americans, Mexicans consist of many races, including White, which both Gaby and, especially, Carlos are. This explains why Libby initially thought they might be Italian, a generally White European ethnicity/nationality often mistakenly thought of as non-White.