[7] Jeff "Swampy" Marsh, a storyboard writer, says that Heffer's right eye and left nostril are "notched at the bottom" due to Murray's design style.

Despite their obvious differences, Heffer has no knowledge of his adoption until Rocko accidentally revealed the truth when the Wolfe family invited him for dinner.

Also he seems to be a hopeless romantic at times as mentioned in "Sugar Frosted Frights", where he asks Filburt's shell while in an eight-ball mode if he will ever find true love.

Heffer holds several jobs: tree farmer, greenskeeper at a golf course, mail carrier, security guard, waiter at a café, and cashier.

[12] Heffer's biological father lives with a female cow named Joyce in a trailer in the Canoga Park section of the San Fernando Valley region of Los Angeles.

[2] A shaved and elderly character resembling Heffer appears in the series finale of Camp Lazlo as the real scoutmaster; both him and the impostor were voiced by Tom Kenny.