The shots of the exterior of Warehouse 15, including its explosion, were from the Sylvester Stallone movie The Specialist.
According to writer Steven S. DeKnight, the exchange between Lex and Lana in which he mentions Clark has "nice hair" and "how lucky he is" provides an insight into Lex's feelings of inadequacy and envy of Clark.
This is the second time Lex has been shot in the space of a few weeks. He was also shot in "Lexmas".
When Clark and Martha are talking on the farm you can see the wrecked truck Clark destroyed in "Splinter" in the background.
The repercussions of Clark's saving Lana from the Warehouse 15 explosion are revealed in "Cyborg".