Final answer:
The paragraph contains four pronoun-related errors: unclear antecedent, misuse of possessive form, unclear antecedent, and misuse of pronoun.
Step-by-step explanation:
The paragraph contains four pronoun-related errors. The first error is the use of the pronoun 'it' without a clear antecedent. The second error is the misuse of the pronoun 'its' as a possessive form instead of 'it's' as a contraction of 'it is'. The third error is the use of the pronoun 'they' without a clear antecedent. And the fourth error is the misuse of the pronoun 'they' instead of 'it' to refer to a single day.