Three JPG images exist in the Arcade GP ROM. These were likely used to test the NamCam player portrait feature.

• The first one depicts a simple multicoloured striped flag.

• The second image shows the mascots of Expo 2005 in Aichi, Japan.

• The Third image appears to be from a 2004 Beslan school hostage crisis, where armed separatist militants took over 1100 people hostage in a Beslan school, killing over 380 people. It's unknown why Nintendo would use such a photo.
Contributed by DeerBoarDude