They can add dialogue. Put days of the week, alphabet, months of the year, numbers, or any other logical sequence in order. Have students work silently to put it in order. Give the same sequence to two different groups and see whether they agree on the order or who can arrange it the fastest. Post the dictation on the wall and pair students together.
Students then switch roles for a second passage.
By taking the passage off the wall and circling mistakes in their work, they can see which words are problematic for them. I don't recommend making this one a contest, especially if you have a large class and lots of desks to climb over. I write sample test questions on an index card, one index card for each student in the class. On the flip side of the card I write the answers to the questions. As a review for the test, students get one minute at each desk to read the questions, write and check their answer.