- Seagull appears in the artwork for and is quoted in the descriptions of and . He also appears in the artwork for .
- Seagulls are completely docile in Flying Red Barrel unless shot at first, which causes them to come back and attack.
- A Seagull named Jonathan appears in Flying Crimson Barrel, likely as a reference to Jonathan Livingston Seagull. The name Jonathan later became a consistently used name for Seagull in both 100% Orange Juice! and 200% Mixed Juice!.
- Seagull's Beach Accessory appears to be a reference to the character Jotaro Kujo from JoJo's Bizarre Adventure.
- Prior to Version 1.15, Seagull had no music theme of his own; when leveling up, theme ▶️ was played instead.