Cultural issues
Many ESOL students come from countries where the education system is based on rote learning through the teacher. The idea of them getting involved in their own learning is not something that comes easily. In some cases students might think that all they need to do is turn up to class to learn English. Keep monitoring targets to avoid this.
EFL students are largely very westernised and most published materials are aimed at the cultural models they are comfortable with. ESOL students, on the other hand, may not know or care who Brad Pitt is. Make sure your material is right for them. Sometimes this makes it difficult to get hold of culturally appropriate materials.