Well, interview wise, it is much quicker - you get interviewed on the same day as all the other short-listed candidates. If you are the top choice, you usually hear from the committee on the same day or the next day. And they often expect you to decide right away whether you accept the offer or not. They want to move fast - if you don't take the job, they move on to the 2nd best candidate.
Pay-wise, salaries of lecturers at the same rank are relatively fixed and comparable across different universities - unless you work in London, in which case, you will get paid a bit more due to the higher living costs there.
Also, if you are a full-time lecturer (not a lecturer in the American sense, but *more or less* like an assistant professor in the U.S. as you probably already know), your salary is likely lower than the salary you might get as an assistant professor at a comparable (ranking wise) university in the US.
Unlike in the US where instructors usually have the final say on what materials they want to use in their classes, in the UK, you usually need to submit a course description to the school to get approved. Getting approved is usually not a huge deal, but if you want to make any change, especially when a change involves the way students are graded/assessed (e.g. grade breakdown, change the number of exams from 2 to 3), you need to submit paperwork.
publications...my feeling is that their publication requirement is more demanding than in the US.
