The one day change in the SPY from 11/29 to 11/30 is + $1.67 (+0.61%). It is not the return for the period of March 1 - Nov 30, 2018.
Yahoo provides the actual close and the adjusted close. For example, if you bought 100 share of SPY at the 9/20 close of $293.58 then close on 9/21 would be $291.99. 9/21 was the ex-div date for $1.323. Your equity position would be down $1.59 but you would be receiving $1.323 on the Pay Date. Therefore, your actual loss was 27 cents.
The adjusted close takes the dividend into account. $291.99 from 9/21 less $292.26 from 9/22 is the same loss of 27 cents.
Reinvesting the dividends would change these numbers slightly because each reinvested dividend would have a different cost basis. Not reinvesting the dividends for March 1 to Nov 30, 2018 would have performed slightly better because 2 of the 3 dividends received during this time period would have been reinvested at higher prices.