YMMV / OOO, Den-O, All Riders: Let's Go Kamen Riders

• Fridge Brilliance: It's always a little weird to see the 13 Riders in crossovers, considering that their Rider War ceased to exist due to Shiro Kanzaki changing time so that the Rider War never happened. However, this time, there's a very big justification: It's not just the whole Temporal Paradox plot where time is all messed up. The Owner himself said that the Riders came back because of people's memories of the Riders. Considering that the Rider War has happened multiple times thanks to Shiro's Time Vent, people probably have several timelines worth of memories of them helping or saving them, especially Ryuki. This also probably explains why, despite some of them being complete psychopaths or jackasses, they all show up for the finale: Since they indirectly help people by killing Mirror Monsters, people only remember them being saviors, and thus all of them became heroic (note at this point that Takeshi Asakura has a laundry list of arrest warrants and otherwise remained under the radar, but as Kamen Rider Ohja he once saved a girl on a cruise ship from three Mirror Monsters. He only shows up as Ohja because that's how he was remembered!)
• Special Effect Failure: Momotaros as a disembodied hand (like Ankh); in one closeup shot the rest of the actor's limb can be seen moving against the Chroma Key.