Finn's father is said to have died in the Persian Gulf War when Finn was a baby. However, that war ended in 1991. This would make Finn around 20 years old instead of the 16-17 year old high school junior he is supposed to be.
However, a recent storyline explains that Finn's mother lied about the death of his father, which could explain the mistake in this episode.
Burt says it has been ten years since Kurt's mother died. Kurt has said he was 8 years old when his mother died. Kurt's character is only 16 in this season, so the math is wrong somewhere.