- The creatures on "Polymerization" appears in this card's artwork, both on the cup and in the background.
- The picture on this card is a reference to "instant noodles".
- "Instant Fusion" is the only card that can Fusion Summon a monster from the Extra Deck without involving other cards.
- "Instant Fusion" has a Ritual counterpart, "Ritual Foregone".
- They have the same LP cost for activation.
- Their affected monsters can't attack and are destroyed during the End Phase.
- Only one of each can be activated per turn.
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