was written and directed by series co-creators Dan Povenmire, and storyboards were constructed by multiple artists in the show's production staff.

The boys and Candace return to a muddy area where the T. rex has left a massive footprint, which they recognize will eventually be on display in the museum in the present.

[1] Series co-founder Dan Povenmire was assigned to develop the script, and simultaneously artists Jon Barry, Mike Roth, Kent Osborne, and Aliki Theofilopoulos constructed the episode's storyboards.

A concept was eventually conceived as a way to do so, having "Phineas and Ferb go into the future and actually see Candace as an adult (which) drags up all kinds of memories of not being able to bust them."

[1] Povenmire and Marsh proceeded by singing their draft of the song into the answering machine of the series' composer, Danny Jacob, that Friday night.

", "The Fast and the Phineas", "Lawn Gnome Beach Party of Terror", "Flop Starz", "Raging Bully", "Lights, Candace, Action!"

[11][12] Multiple[failed verification] critics have noted that the portrayal of Doofenshmirtz and Perry's relationship in the episode features a somewhat of a homosexual subtext.

[13] The concept behind it is a parody of stereotypical teen romance film, casting Perry and Doofenshmirtz—two males who are of different species—as the teenage couple who is "breaking up".

Doofenshmirtz initially tries to deny having a new nemesis, but eventually admits to the accusation, noting that he "didn't want [Perry] to find out this way," overtly detailing a common way couples discover their partner is cheating on them.

[13] Perry is depressed about their "break up" and reminisces about their past "relationship" together, while music resembling a love song plays in the background.

After feeling depressed himself, Doofenshmirtz "dumps" Peter and reunites with Perry on a talk show prone to featuring romantic confrontations.

Blogcritics reviewer Aaraon Peck applauded the Perry and Doofenshmirtz B-Plot, considering it as both the official Pret episode and an example of the series' ability to allow "adults [to] enjoy the humor" and not strictly focusing on the entertainment of younger viewers.

[13] A Wired magazine review of the series' soundtrack observed that despite being drastically different from tracks that proceed and precede it, "When We Didn't Get Along" "fit perfectly" due to "the genius of the malleable songwriting style of Phineas and Ferb's musical brain trust.