As we all know, aside from fan apparel or promotional material, sponsorships are not allowed on national team jerseys. In the beginning of the 1980's however, the Brazilian Confederation received a sponsorship of 3 million USD from the Brazilian Coffee Industry, a fortune for the time.
A jersey with the company's coffee leaf logo was made (as seen in the picture above with Pele's billboard) but FIFA quickly banned it. The confederation decided that the solution was to bend the rules, they redesigned the crest with the Jules Rimet trophy and inserted the logo inside of it as if it was part of the design.
Brazil played the 1982 World Cup with this logo, and got away with it for the entire cycle leading up to the '86 World Cup. Right before the tournament FIFA caught on to what was happening and requested Brazil to remove the logo from within the crest.
With the sponsorship gone Brazil went back to its original crest which it used to this day.