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Riddle says the counterfeit bills lacked the portrait watermark and security thread.

He says while the prop money looks real, it feels heavier than real currency and is also missing the security thread.

These include a special paper with raised print, a portrait window and security thread, a silver stripe that reveals a portrait of Europa, and an emerald number that reflects light.

For example, a $20 bill has the color-shifting ink on the denomination in the bottom right-hand corner, a ghost portrait of Jackson on the right side and a security thread with the word twenty written over and over.

These combine with traditional security features, such as a portrait watermark and an embedded security thread that glows pink under ultraviolet light.