The song "Someday We'll Be Together" is heard playing on Beth's stereo. This episode takes place in April, 1969. That song wasn't released until October, 1969.
Outside the San Diego Police Department sits a Dodge Aspen, which was produced from 1976 to 1980 and could not have existed in 1969.
This episode is dated Apr. 1, 1969. Beth is supposedly wearing Al's MIA bracelet. However, MIA bracelets did not come about until Nov. 11, 1970.
In this episode, when Al is dancing with Beth at the end, he says it's been 25 years since he last saw her which would make the year of the project 1994. However, in an earlier episode Al said he had been watching Super Bowl XXX which would have taken in 1996.