According to an interview with Annette O'Toole, she disagreed with the writers and felt that given Clark's tenuous situation with Lana and Lex, Martha would never have agreed to attend their engagement dinner.
The CW released a poster with the tagline "The Legendary Love affair begins tonight." to promote the start of Lois and Clark's hidden romantic feelings for each other that are brought to the surface by red kryptonite.
This is the first time Clark, Lana, and Lex are seen in the Kent barn together.
Interestingly, Lionel Luthor does not appear in this episode, even when it is his son's engagement party and Martha is there. In a deleted scene, Martha goes to the Mansion and gives Lana a gift, a piece of heirloom family jewelry. She explains that Lionel was out of the country and unable to return. According to the Smallville Official Companion Season 6 book, Annette O'Toole objected to Martha attending the party, out of loyalty to Clark. However, the writers explained that Lana thought she intended to stay after dropping off the gift, so she did in order to not hurt Lana's feelings.
Clark mentioned that Lex wanted everything he had, with Lana being at the top of that list. Lex had said this to Clark in "Vessel" right before he was inhabited by General Zod.