In example 1 it is clear that the girls are freaking out because of the crazy things he does.
In examples 2 and 3, the causal relationship is less clear. If within the context, there is another potential cause for the girls to freak out (other than the crazy things he does), it would be possible to interpret the sentence as a list of different reactions to a different stimulus (established by previous context).
For example, if the preceding sentence said "All the students have different reactions when there are thunderstorms outside." then we would not necessarily think that the crazy things he does cause the girls to freak out, they could be freaking out due to the thunderstorms.