I interpret it this way. When they came up with the game idea, the building was on the right. When they handed the artwork to the LCD maker, he accidentally made it reversed. Rather than redoing his part, they just left it as is. Maybe the score and "miss" were backwards and they just fixed that to save money/time. Who knows? I have a feeling no actual units were produced with the building on the right.
View my gameplay videos:
Light Gun Games with Aimtrak
Trackball Games with X-Arcade Trackball
Star Wars Episode 1 Racer with Dual Throttle Controls