While the assassin crawls through the doggy door, Sam surprises him from the outside and opens the door, slamming his head into a stainless steel trash can which tips over. In the next shot of the assassin, the trash can is upright.
When Nell talks in Ops about usual Internet and Deep, she says "90 percent of the Internet is inaccessible through the use of traditional search engines" but actually it is accessible through traditional search engines. they don't cover Deep Web sites.