Audio problem: In the final song, "This is What It's Like to Be Lovers", the lead male studio singer starts the song, not David Cassidy, then they switch to David Cassidy's real voice halfway through for just two lines, then they switch back to the male voice of the studio singer.
Princess and the Partridge - S3-E3
Continuity mistake: Keep an eye on the woman seated behind the Princess at the concert. In some shots she is wearing a necklace and seated beside a younger man; in others, she has no necklace and is seated beside an older man. (00:21:55)
Reuben Kincaid: ...Good day.
Danny: It was until now.
Trivia: Danny is humming show tunes. Keith sarcastically asks "What's next? Oklahoma?" Shirley Jones, who played Shirley Partridge on the show, was in the movie "Oklahoma!" (00:07:30)