Rewards
Rewards can help catch students' interest in a subject, but if too many rewards are given, they will not hold interest. Students become more interested in the reward than the subject matter. Conversely, if a student is already interested in a subject, offering rewards might be seen as annoying and detract him/her from the subject. (Bergin, 1999)
Irrelevant Details
Interesting details that are irrelevant to what is being taught can take the lesson off course or lead to students failing to learn. (Bergin, 1999)
Group Work/Socializing
Although socializing can enhance a learning experience, too much socializing will obviously inhibit the learning process. It is important to check in on groups to make sure actual progess in learning is occurring. (Bergin, 1999)
Discrepancy
Humans are stubborn. A student may dismiss discrepancies instead of try to resolve them. (Bergin, 1999)
Novelty
A task that is too novel may cause frustration instead of learning. Also, if the novel task/subject is not supported by other motivational attributes, when the novelty naturally fades, so will the interest. (Bergin, 1999)