Make sure you have both your resume and references with you. make sure to clean yourself up beforehand
Good technical preparation is needed and they also test you for soft skills.
Just have a resume and be willing to work.
Longo's is very professional so be prepared for off topic questions such as; if you were to be an animal, which one would you be and why?
Interviewers are very interested in your people skills, and the way you react in certain situations