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According to a Japanese promotional tape, earlier versions of some of the special weapons function differently than they do in the final game:
• Star Crash was a single attack that homed in on enemies rather than being used as a shield.
• Gravity Hold stopped time instead of defeating all enemies on screen.
• Gyro Attack did not have a limit and it could be used in multiple directions at once.
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It is theorized that Mega Man 5 was banned in Vietnam due to the inclusion of Napalm Man, a level design much like Viet Cong tunnels that includes traps, enemies named and designed after animals from areas in and around Vietnam, and more. The Viet Cong fought both the United States and South Vietnamese governments during the Vietnam war between 1959 and 1975.
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Attachment In Dr. Wily's Castle Stage 1, during the boss fight against Big Pets, there is a rare glitch where the platforms look like they remain stationary, but the game still acts as if they are moving as intended.
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Using an M-Tank while Mega Man's health and all his weapons are full will cause all non-boss enemies on the screen to turn into 1-ups.

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