Follow That Bird was probably filmed open matte at 1.33:1 and then composed for 1.33:1 AND 1.85:1 aspect ratios.
The filmmakers at the time probably knew the film would get more exposure on TV, so they filmed it 1.33:1 safe.
99.9% of 1.33:1 transfers of 1.85:1 films have the entire frame exposed, not cropped on the sides like an anamorphic or wide gauge film (VistaVision, 70mm, etc).
I still think it was lazy of WB to not make this a dual-layer or double-sided disc with both versions.
The filmmakers at the time probably knew the film would get more exposure on TV, so they filmed it 1.33:1 safe.
99.9% of 1.33:1 transfers of 1.85:1 films have the entire frame exposed, not cropped on the sides like an anamorphic or wide gauge film (VistaVision, 70mm, etc).
I still think it was lazy of WB to not make this a dual-layer or double-sided disc with both versions.