Oliver (around age 29) tells Clark that his parents died when he was five years old. However, this is not consistent with the Smallville timeline saying that Robert and Laura Queen died in 1989, leaving Oliver orphaned at the age of nine.
When Lois is fixing Clark's story, she writes with her left hand.
When Clark is in the Fortress, some of the crystals are still black, which is the direct result of Brainiac's infection in "Abyss".
Lois's overheard-thought mentioning "Lifetime" refers to the Lifetime cable TV network(s), for which Erica Durance has done some TV movies between seasons or episodes of Smallville.
This is the first time that Clark has ever received a power that was not part of Superman's common canon abilities from the Post-Crisis comics. A Golden Age issue had Superman developing telepathy but it was limited to projecting thoughts into others' heads.