Dan must travel back to Christmas Eve 1979 to prevent layoffs at the job.Dan must travel back to Christmas Eve 1979 to prevent layoffs at the job.Dan must travel back to Christmas Eve 1979 to prevent layoffs at the job.
In the beginning of the episode, Katie is making cookies with flour purchased from Vons, which is the Los Angeles branding of the Safeway chain; in San Francisco they would have gotten the flour at Safeway instead.
Everything after the initial shot of traffic on the Golden Gate Bridge is actually moving backwards (pigeons flying, city traffic, Ferry Building clock hands, etc.)