Yugoslavia was never part of the Warsaw Pact. They played the "non-aligned" card during the Cold-War.
The original members were: Soviet Union, Albainia, Bulgaria, Romainia, Hungary, Poland, and Czechoslovakia. East Germany joined in 1956. The treaty was signed in 1952 by the originals and was for mutual defense along the lines of NATO. It also was supposed to prevent one member nation from meddling int he affairs of another.
When the Soviet Union invaded Czechoslovakia, Albainia withdrew from the pact though they had already stopped supporting the treaty after the Sino-Soviet split in 1961. Albainia was actually a Chinese "client" state, and not a Soviet one. Romainia also denounced the invasion as a breech of the pact.
It was dissolved in Prauge in 1991.
As for the ad, it's just sales hype. Standardization across the Warsaw Pact was much better than NATO, but in reality there's no "NATO inspector" or "Warsaw Pact inspector" who runs around chcking on the quality of stuff. Alot of people think that NATO standard was really important, or that it really meant something, and in reality it didn't. In the very early days there was some effort to standardization, but most of that was in reality the USA forcing things on it's allies. Each country went it's own way quite often and most standardization was in doctirne/administrative functions.
For example, while 7.62 was NATO standard, we used 5.56mm there and were the only nation to do so for quite some time. At one time the Brits had a 120, the Germans had a 120 and we had the 105, none of which could fire the other's ammo. When people say "oh, we did it because it's NATO standard" they generally don't know what they're talking about. NATO standardization was more for cost and convinience.
Warsaw Pact on the other hand standardized much better, due to the heavier hand of the Soviet Union. Things like trucks, rifles, aircraft, etc. were all fairly standard and just built by the vairous members. Some odd-ball things exist, usually Czech stuff because they had a developed arms industry, but really the Warsaw Pact did much better in standardizing.
When you think about it, it's much more important for an alliance to all be using the same truck or cargo plane than it is for them to use the same tank.