In my experience, lack of research by a candidate is always something that an interviewer will remember, as well as their excuses for not knowing anything. It is important for candidates to research the company, and department that they are interviewing for- if you don't know anything about the company or department it makes the interviewer question why you would want to work there, not knowing what they do or their ethos.

If you think that you will struggle to remember what you have read, take notes on key points that you like or think would be a talking point and then use these in the interview, this shows that you are prepared, and have an interest in the role and the company. Be careful blaming the website for a lack of information, if the interviewer knows that there is a lot of information on the website, this will undermine your creditability and again, make them question your interest in the company. If you have forgotten what you read- tell them! Honesty works much better in that situation than a lie that could backfire.

It is also a good idea to have a few questions that you can ask the interviewer, either throughout the interview or at the end, these could be about the department, the workload or anything else that is important to you in a new job and working environment. Again, this shows that you have a genuine interest in the job and the company.