Continuity mistake: When the squad is crossing the cleared cornfield and encounters mines, each individual is forced to meticulously check with his knife and crawl individually to where he could follow Kelly's path. The cornfield surface all around is uniformly chewed up with moist dirt and lots of plant debris. However, when the German patrol shows up, the remaining soldiers escape along a well-worn, tamped path and the surrounding field looks dried out, smoother, and with much less plant debris. (01:12:00)
Continuity mistake: When Crapgame makes a phone call after speaking to Oddball, his grip on the receiver changes between shots. (00:37:40)
Continuity mistake: When Joe is talking to the Captain about having a guide for the town, the Captain's chin strap on his helmet is twisted or untwisted depending on the shot. (00:12:30)
Deliberate mistake: The German tanks in this movie are not really Tiger tanks. They are Russian T-34's made to look like Tigers. The T-34's are done up very realistically, including Zimmerit (the wavy pattern on the hull of the tiger), which was an anti-magnetic paste put on the tank.
Answer: It's a Yugoslav Soko 522 Ikarus.