1971 ALCS Game 2 ticket stub Athletics vs Orioles

What’s with the snowflake/cotton ball behind The Oriole Bird on this 1971 ALCS Game 2 ticket stub Athletics vs Orioles? Would love to find out.

This ticket stub available for purchase

1971 American League Championship Series (ALCS) Game 2, Athletics at Orioles, October 4

ALCS ticket stubs for sale

1971 ALCS Game 2 ticket stub Athletics vs Orioles

 

1971 ALCS Game 2 ticket stub Athletics vs Orioles