After Gary's death, Val goes to the ranch to console Abby, who angrily tells Val that she's Gary's widow, not Val, and that Val is "nothing to him." Although they were divorced, Val is still the mother of Gary's firstborn (and up until this point) only child, Lucy. I think that qualifies as something.
I believe that Mack or Gary had called the Ewings in "Dallas" and told them of their ruse. In fact, Greg Sumner was suspicious enough to ask Karen in the next episode why the Ewings didn't attend Gary's funeral, which led Karen to discover that Mack had been lying about Gary's death.
Gary is believed dead but his mother and brothers did not come to the funeral?! Obviously there were production and financial problems in having everyone cross over from "Dallas" (or maybe they knew he wasn't really dead, as is alluded to in the next episode) but from here on the two series would have many problems both when they did cross over (Bobby's "death" which was Pam's dream) and when they should have crossed over like here and they didn't.
I forgot to mention Gary's daughter (Lucy) also should have been at the funeral if they believed Gary was dead.
Laura reveals in this episode, that she sold the restaurant, Daniel, which she and Richard opened in season 4.
Karen is found unconscious from drugs, in the bath tub, with water showering on her face.
This is similar to season 3 when Richard found the hooker, also unconscious from drugs, in the shower with water showering on her face.
Gary claims to never have discussed the subject of marriage with Abby. Yet in the previous episode, he introduced Abby as his fiancée to Greg Sumner.
The common belief amongst Knots Landing characters is that Chip killed Ciji. Curiously, neither Gary nor Laura appear to have any problem with Chip, even though they both cared greatly for Ciji.