Good observations! I couldn't remember Brandon ever wearing those Brown Converse Chuck Taylor's before but he wore them off the helicopter.Brenda often wears Flip Flops to challenges.
Here's what I found...
Ep1 RC/IC: Brenda in Flip Flops; Brandon in High Top Chuck Taylor's
Ep2 RC/IC: Brenda in Flip Flops; Brandon in Low Top athletic shoes
Ep4 RC: Brenda in Flip Flops; Brandon in Low Top athletic shoes
Ep4 Camp: Brenda in Flip Flops; Brandon Bare Foot
Ep4 IC: Brenda in Low Top athletic shoes; Brandon in Low Top athletic shoes
Ep5 RC: Brenda in Low Top athletic shoes; Brandon in Low Top athletic shoes
Ep5 IC: Brenda in Flip Flops; Brandon Bare Foot