Eichen House is suggested to be related to Oak Creek Internment Camp from WWII; "eichen" is the German word with Oak.
Young Noshiko Yukimura is played by Arden Cho who plays her daughter (Kira Yukimura) in the show.
Kira asks her dad how old he is, and he says "Forty-three, though I've been told I look mid-30s". Tom Choi was only 34 when this episode aired (and is only five years older than Arden Cho).